CXA2094 Sony Corporation, CXA2094 Datasheet - Page 18

• Manufacturer Part Number: CXA2094
• Description: US Audio Multiplexing Decoder
• Manufacturer: Sony Corporation

(6) Matrix, TVSW
(7) Others
The variable de-emphasis circuit transmittance and VCA gain are respectively controlled by Each of
effective value detection circuits. Each of the effective value detection circuits passes the input signal
through a predetermined filter for weighting before the effective value of the weighted signal is
detected to provide the control signal.
The signals (L + R, L – R, SAP) input to “MATRIX” become the outputs for the ST-L, ST-R, MONO and
SAP signals according to the mode control and whether there is ST / SAP discrimination.
“TVSW” switches the “MATRIX” output signal, external input signal (input to AUX1-L, R (Pins 42 and
41)), external input signal (input to AUX2-L, R (Pins 45 and 44)) and external forced MONO.
“MVCA” is a VCA which adjusts the input signal level to the standard level of this IC.
“Bias” supplies the reference voltage and reference current to the other blocks. The current flowing to
the resistor connecting IREF (Pin 15) with GND become the reference current.
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CXA2094Q